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Microchip Technology MAPLAD36KP40A
- Part No.:
- MAPLAD36KP40A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP40A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,131
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Product details
Overview
MAPLAD36KP40A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps at ≤64.5 V under 559 A peak impulse current, and features a 40 V reverse standoff voltage (VWM) with 44.4–49.1 V breakdown range. It meets RTCA DO-160 Section 22 multi-stroke lightning requirements and IEC 61000-4-5 Class 5 secondary lightning protection with 42 Ω source impedance.
For engineers reviewing the MAPLAD36KP40A datasheet, MAPLAD36KP40A pinout, MAPLAD36KP40A application, or MAPLAD36KP40A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance, RoHS-compliant packaging, and verified surge testing to 1000 A are critical - especially in aircraft avionics power inputs, engine control modules, and industrial DC link interfaces.
Technical Context
The MAPLAD36KP40A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and low clamping ratio (VC/V(BR) ≈ 1.38). Its metal-base package provides direct thermal path to PCB copper, achieving 1.0 °C/W junction-to-case thermal resistance when mounted per recommended pad layout on FR4.
It operates across –55°C to +150°C junction temperature, supports steady-state dissipation up to 71 W at TC = 100°C, and maintains <10 μA standby current at rated VWM. Compliance includes AEC-Q101 qualification, IEC 61000-4-2/4-4 ESD/EFT immunity, and RTCA/DO-160F Waveform 4 & 5A pin injection protection up to Level 5 (300 V VWM variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains full-rated lightning surge energy without failure |
| Reverse Standoff Voltage (VWM) | 40 V - maximum continuous DC operating voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 44.4–49.1 V @ 5 mA - defines guaranteed avalanche initiation threshold |
| Max Clamping Voltage (VC) | 64.5 V @ 559 A - limits downstream circuit voltage during worst-case surge |
| Peak Pulse Current (IPP) | 559 A @ 10/1000 μs - quantifies maximum surge current the device safely shunts |
| Thermal Resistance (RθJC) | 1.0 °C/W - enables efficient heat transfer from junction to case/mounting pad |
| Standby Current (ID) | <10 μA @ 40 V - ensures negligible leakage in standby operation |
Pinout & Package
MAPLAD36KP40A uses a void-free transfer-molded thermosetting epoxy PLAD package (UL94V-0), with cathode on the metal base (bottom side) and anode on top-side metallization. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ~1.8 g. Requires recommended FR4 pad layout (A = 11.94 mm, B = 5.85 mm) for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side metallization) | Surge current entry point for unidirectional clamping | Connected to protected line; conducts during positive transients relative to cathode |
| Cathode (metal base / bottom) | Reference and heat sink interface | Must be soldered to large copper pour for thermal management and low-inductance ground return |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package | Enables high-density placement on power input stages without height constraints |
| 3σ lot norm screening on ID | Ensures consistent low-leakage behavior across production lots for mission-critical systems |
| MIL-PRF-19500 upscreening option | Supports high-reliability programs requiring military-grade screening (M, MA, MX, MXL levels) |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to reflow, reducing assembly cost |
| AEC-Q101 qualified | Validated for automotive under-hood applications including load dump and ISO 7637-2 compliance |
Applications
| Aircraft Power Input Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC aircraft avionics power bus against multi-stroke lightning surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary parallel TVS clamp placed directly at power entry connector to divert >30 kA surge currents away from downstream converters and regulators. Use Value: Enables compliance with Level 5 pin injection (Waveform 4) and Class 5 secondary lightning (42 Ω source) without derating - validated at full 36 kW rating. | Use Scenario: Safeguarding 12 V/24 V ECU power rails from alternator load dump transients and ISO 7637-2 Pulse 5a/b events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and chassis ground, clamping within 100 ps to limit voltage overshoot below 65 V. Use Value: Prevents microcontroller reset or gate driver latch-up by maintaining clamped voltage ≤64.5 V at 559 A, with RθJC = 1.0 °C/W enabling sustained operation at 100°C ambient. |
| Industrial DC Link Surge Suppression | Railway Signaling Power Interface |
Use Scenario: Protecting 48 V DC traction converter auxiliary supplies from switching-induced transients and induced RFI in rolling stock. IC Role / Device Role / Timing Role: High-power TVS placed across input capacitor bank to absorb repetitive 10/1000 μs surges up to 0.05% duty cycle. Use Value: Delivers 36 kW peak power handling with <10 μA leakage at 40 V, ensuring no impact on system efficiency during normal operation. | Use Scenario: Securing 72 V signaling power inputs in EN 50121-3-2 compliant railway electronics against EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable family member (via CA suffix) used as unidirectional clamp on positive rail, referenced to protective earth. Use Value: Meets IEC 61000-4-4 Level 4 EFT (4 kV) and IEC 61000-4-5 Class 4 (2 Ω source) with clamping margin of ≥15 V below system overvoltage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A | 600 W PPP rating, 5.0 mm × 4.5 mm SMB package, RθJC ≈ 25 °C/W | Lower energy handling; suitable only for single-stroke or low-duty-cycle transients | Select SMBJ40A only for cost-sensitive non-aerospace designs where 36 kW capability is unnecessary |
| SMCJ40A | 1500 W PPP, 7.2 mm × 6.2 mm SMC package, RθJC ≈ 12 °C/W | Lacks RTCA DO-160F Waveform 4/5A validation and AEC-Q101 qualification | Use SMCJ40A for industrial controls needing higher energy than SMB but not requiring aviation-grade surge certification |
Compared with SMBJ40A and SMCJ40A, MAPLAD36KP40A provides 24× and 24× higher peak pulse power respectively, validated clamping performance under multi-stroke lightning, and traceable lot-level reliability screening - making it the sole choice for certified aerospace and high-end automotive power protection.
Availability
MAPLAD36KP40A is available at Aetrix Electronics and suitable for aircraft avionics power inputs, automotive engine control units, and industrial DC link surge protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MAPLAD36KP40A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and power management solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP40A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where thermal robustness, surge repeatability, and qualification traceability are mandatory.
FAQ
What is the clamping voltage of MAPLAD36KP40A at its rated peak pulse current?
The MAPLAD36KP40A has a maximum clamping voltage (VC) of 64.5 V at 559 A peak pulse current under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 Rev B datasheet and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events. The clamping performance is guaranteed across –55°C to +150°C junction temperature.
Is MAPLAD36KP40A qualified for automotive applications?
Yes, MAPLAD36KP40A is AEC-Q101 qualified and explicitly validated for automotive load dump protection per ISO 7637-2. Its 40 V VWM and 64.5 V clamping voltage align with 24 V system requirements, and its 1.0 °C/W RθJC enables reliable operation at 100°C case temperature. The device also passes surge testing to 1000 A, exceeding typical automotive test limits.
Does MAPLAD36KP40A require moisture sensitivity handling?
No, MAPLAD36KP40A has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it does not require dry packing or baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates yield loss from moisture-related popcorning. The void-free epoxy body and annealed matte-tin plating ensure robust solderability per MIL-STD-750 Method 2026.
How is thermal management implemented for MAPLAD36KP40A?
MAPLAD36KP40A relies on its metal-base cathode for thermal conduction. To achieve the specified 1.0 °C/W RθJC, it must be mounted on a minimum 11.94 mm × 5.85 mm copper pad on FR4, per the recommended pad layout in RF01216 Rev B. No external heatsink is required, but thermal vias under the pad significantly improve board-level heat spreading and reduce RθJA from 50 °C/W to <30 °C/W in optimized layouts.
Can MAPLAD36KP40A be used in bidirectional configurations?
No - MAPLAD36KP40A is unidirectional. For bidirectional operation, the equivalent part is MAPLAD36KP40CA, which adds symmetrical clamping for AC-coupled or floating-rail applications. The "CA" suffix denotes bidirectional construction; the "A" suffix in MAPLAD36KP40A confirms unidirectional polarity, with cathode on the metal base and anode on top-side metallization.
MAPLAD36KP40A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 559A
- Power - Peak Pulse:
- 36000W (36kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PLAD
MAPLAD36KP40A FAQ
1.How can I place an order for MAPLAD36KP40A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP40A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAPLAD36KP40A reliable?
The price and inventory of MAPLAD36KP40A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP40A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP40A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP40A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP40A?
MAPLAD36KP40A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP40A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAPLAD36KP40A?
For technical support, including MAPLAD36KP40A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP40A requirements.
6.How does Aetrix verify that MAPLAD36KP40A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP40A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAPLAD36KP40A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP40A?
All MAPLAD36KP40A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP40A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAPLAD36KP40A part is unused and in its original packaging.
Return procedure for MAPLAD36KP40A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP40A Tags
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